content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.*;
  
  final class IxBuffer<T> extends IxSource<T, List<T>> {
  
      final int size;
  
      IxBuffer(Iterable<T> source, int size) {
          super(source);
          this.size = size;
      }
  
      @Override
      public Iterator<List<T>> iterator() {
          return new BufferIterator<T>(source.iterator(), size);
      }
  
      static final class BufferIterator<T> extends IxSourceIterator<T, List<T>> {
          final int size;
  
          BufferIterator(Iterator<T> it, int size) {
              super(it);
              this.size = size;
          }
  
          @Override
          protected boolean moveNext() {
              int s = size;
  
              Iterator<T> it = this.it;
  
              List<T> list = new ArrayList<T>();
  
              while (s != 0 && it.hasNext()) {
                  list.add(it.next());
                  s--;
              }
  
              if (list.isEmpty()) {
                  done = true;
                  return false;
              }
              value = list;
              hasValue = true;
              if (s != 0) {
                  done = true;
              }
              return true;
          }
  
  
      }
  }
  